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    Water Mass Transformation in the North Atlantic and Its Impact on the Meridional Circulation: Insights from an Ocean Model Forced by NCEP–NCAR Reanalysis Surface Fluxes

    Source: Journal of Climate:;2003:;volume( 016 ):;issue: 019::page 3085
    Author:
    Gulev, Sergey K.
    ,
    Barnier, Bernard
    ,
    Knochel, Herve
    ,
    Molines, Jean-Marc
    ,
    Cottet, Melanie
    DOI: 10.1175/1520-0442(2003)016<3085:WMTITN>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Decadal-scale climate variability in the North Atlantic thermohaline circulation is simulated using a sigma-coordinate primitive equation model, forced by NCEP?NCAR reanalysis surface forcing fields for the period from 1958 to 1997. Surface heat and freshwater flux are expressed in terms of surface thermal and haline density inputs, diagnosed by the model. Variability in surface density fluxes is closely correlated with the North Atlantic Oscillation and demonstrates differences with the original surface heat and freshwater fluxes. Leading modes of surface water mass transformation are considered in the T?S plane. They identify decadal-scale variability associated with the transformation of the Labrador Sea Waters and Subtropical Mode Waters. Analysis of the model responses to the surface forcing shows an immediate reaction of meridional heat transport to the wind stress curl, resulting in a decrease of meridional heat transport at 48°N and an increase in the subtropics. Delayed baroclinic responses to the surface heat forcing are identified at time lags of 3 and 7 yr. The 3-yr response is represented by an increase in the total meridional heat transport in subpolar latitudes and its simultaneous increase in the Tropics and midlatitudes. The 7-yr delayed response to the surface heat forcing is associated with the strengthening of meridional heat transport at all latitudes. However, 7-yr responses may be influenced by the self-correlation in the meridional heat transport and forcing function. Meridional overturning is largely responsible for the variability observed, demonstrating high correlation with meridional heat transport.
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      Water Mass Transformation in the North Atlantic and Its Impact on the Meridional Circulation: Insights from an Ocean Model Forced by NCEP–NCAR Reanalysis Surface Fluxes

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4204734
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    • Journal of Climate

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    contributor authorGulev, Sergey K.
    contributor authorBarnier, Bernard
    contributor authorKnochel, Herve
    contributor authorMolines, Jean-Marc
    contributor authorCottet, Melanie
    date accessioned2017-06-09T16:13:36Z
    date available2017-06-09T16:13:36Z
    date copyright2003/10/01
    date issued2003
    identifier issn0894-8755
    identifier otherams-6370.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4204734
    description abstractDecadal-scale climate variability in the North Atlantic thermohaline circulation is simulated using a sigma-coordinate primitive equation model, forced by NCEP?NCAR reanalysis surface forcing fields for the period from 1958 to 1997. Surface heat and freshwater flux are expressed in terms of surface thermal and haline density inputs, diagnosed by the model. Variability in surface density fluxes is closely correlated with the North Atlantic Oscillation and demonstrates differences with the original surface heat and freshwater fluxes. Leading modes of surface water mass transformation are considered in the T?S plane. They identify decadal-scale variability associated with the transformation of the Labrador Sea Waters and Subtropical Mode Waters. Analysis of the model responses to the surface forcing shows an immediate reaction of meridional heat transport to the wind stress curl, resulting in a decrease of meridional heat transport at 48°N and an increase in the subtropics. Delayed baroclinic responses to the surface heat forcing are identified at time lags of 3 and 7 yr. The 3-yr response is represented by an increase in the total meridional heat transport in subpolar latitudes and its simultaneous increase in the Tropics and midlatitudes. The 7-yr delayed response to the surface heat forcing is associated with the strengthening of meridional heat transport at all latitudes. However, 7-yr responses may be influenced by the self-correlation in the meridional heat transport and forcing function. Meridional overturning is largely responsible for the variability observed, demonstrating high correlation with meridional heat transport.
    publisherAmerican Meteorological Society
    titleWater Mass Transformation in the North Atlantic and Its Impact on the Meridional Circulation: Insights from an Ocean Model Forced by NCEP–NCAR Reanalysis Surface Fluxes
    typeJournal Paper
    journal volume16
    journal issue19
    journal titleJournal of Climate
    identifier doi10.1175/1520-0442(2003)016<3085:WMTITN>2.0.CO;2
    journal fristpage3085
    journal lastpage3110
    treeJournal of Climate:;2003:;volume( 016 ):;issue: 019
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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